Abstract:
The relation between the contact force and dent depth under quasi-static indentation force is used to predict the dent depth of composite laminates subjected to low-velocity impact. The impact finite element model is developed, and the strain based on Hashin′s criterion and Cohesive element are used to simulate the damage of the laminates. The overall equivalent stiffness of the impact-damaged laminate is calculated by using the damage area, and two depth-energy curve is predicted by the contact force formula. It is found that the calculated results of the maximum damage area are in good agreement with the test values. The predicted dent depths agree well with the test values when the number of plies is small.